Getting started with Qt in Ubuntu Linux

A quick recipe on how to get started with Qt in Ubuntu Linux using a simple example program. 1. Obtain QT4 Run these from the command line: [code language="text"] $ sudo apt-get update $ sudo apt-get install libqt4-dev qt4-qmake cmake r-base-dev libcurl4-gnutls-dev [/code] 2. Create and edit the qmake project file To generate and edit the project file itself use something like: [code language="text"] $ mkdir qt $ cd qt/ $ cat > main.pro & [/code] This example project file, main.pro, is essentially a set of declarations required by qmake to enable you to build your application. Using a text editor of your choice, just copy this into your main.pro text file and save: [code language="text"] TEMPLATE = app SOURCES = main.cpp HEADERS = CONFIG += qt warn_on release TARGET = main QT += gui QT += widgets CONFIG += qt [/code] 3. Create the example application First chttp://www.informit.com/articles/article.aspx?p=412354&seqNum=4reate your sample main.cpp. I often prefer the cat command to create new files: [code language="text"] $ cat > main.cpp & [/code] And using your own Linux-based text editor of choice, create this simple Qt example and save as main.cpp: [code language="cpp"] #include <QtWidgets> #include <QtCore> #include <QLabel> int main( int argc, char *argv[] ) { QApplication *my=new QApplication( argc, argv ); QMainWindow x; QString str = "Hello"; QLabel *label = new QLabel( str, 0 ); x.setCentralWidget( label ); x.show(); return my->exec(); } [/code] 4. Use qmake to create the example project [code language="text"] $ qmake -o Makefile main.pro [/code] 5. Build and run the project [code language="text"] $ make $ ./main [/code] Giving you your first Qt dialog:

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